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Cone cells are responsible for colour vision. They function best in relatively bright light, as compared to rod cells that work better in dim light. Cone cells are densely packed in the fovea centralis, a rod-free area with very thin, densely packed cones which quickly reduce in number towards the periphery of the retina. Accommodation of vision occurs by contraction and relaxation of ciliary muscles. Pupil determines the amount of light that enters the eye. Night blindness occurs due to vitamin A deficiency. It is due to a disorder of the cells in the retina that are responsible for vision in dim light. Binocular vision is a vision using two eyes with overlapping fields of view, allowing good perception of depth. Iris is responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina.